@article{5815,
  author = {A. Bitz and M. Marsi and E. Tuncel and S. Gurtler and J. L. Staehli and B. J. Vartanian and M. J. Shaw and A. F. G. van der Meer},
  title = {Second-harmonic generation involving valence-subband transitions in p-doped GaAs/AlxGa1-xAs quantum wells},
  abstract = {We present second-harmonic generation experiments in p-doped asymmetrically stepped quantum wells using the emission of a free-electron laser in the wavelength interval between 13 and 18 mu m. The wells are designed such that the three fewest valence-subbands are about equally spaced. We measured the angular and frequency dependence of the second-harmonic signal excited by intense laser irradiation chosen to be nearly resonant with the transitions between the three lowest valence subbands. We see evidence of the optical second-order susceptibility components chi(xxz)((2)), chi(zxx)((2)) and chi(zxy)((2)), chi(xyz)((2)) in the quantum wells and determine their enhancement with respect to chi(xyz)((2)) of bulk GaAs.},
  year = {1997},
  journal = {Physical Review B},
  volume = {56},
  number = {16},
  pages = {10428-10434},
  month = {Oct 15},
  isbn = {0163-1829},
  doi = {10.1103/PhysRevB.56.10428},
  language = {eng},
}